backport [18555]

Do not assume long integers are 32-bits.
Should fix fullscreen on amd64

modules/gui/skins2/x11/x11_window.cpp

@@ -73,11 +73,11 @@ X11Window::X11Window( intf_thread_t *pIntf, GenericWindow &rWindow,
 
     // Changing decorations
     struct {
-        unsigned long flags;
-        unsigned long functions;
-        unsigned long decorations;
-        signed   long input_mode;
-        unsigned long status;
+        uint32_t flags;
+        uint32_t functions;
+        uint32_t decorations;
+        int32_t  input_mode;
+        uint32_t status;
     } motifWmHints;
     Atom hints_atom = XInternAtom( XDISPLAY, "_MOTIF_WM_HINTS", False );
     motifWmHints.flags = 2;    // MWM_HINTS_DECORATIONS;